1. First of all? Should I choose this option? In the project window on the left, right-click this file (assuming it is main.c) and select option? For what? Documents? "main.c", select generate? Assembler? SRC？ File and assemble? SRC？ Files, just let them be selected, be careful not to choose gray ones.

2. Do you want to add a library file? C5 1S。 LIB, so you can compile smoothly.